Strongly correlated impurity band superconductivity in diamond: X-ray spectroscopic evidence

Baskaran, G. (2006) Strongly correlated impurity band superconductivity in diamond: X-ray spectroscopic evidence Science and Technology of Advanced Materials, 7 (1). S49-S53. ISSN 1468-6996

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S14686...

Related URL: http://dx.doi.org/10.1016/j.stam.2006.02.010

Abstract

In a recent X-ray absorption study in boron doped diamond, Nakamura et al. have seen a well isolated narrow boron impurity band in non-superconducting samples and an additional narrow band at the chemical potential in a superconducting sample. We interpret the beautiful spectra as evidence for upper Hubbard band of a Mott insulating impurity band and an additional metallic 'mid-gap band' of a conducting 'self-doped' Mott insulator. This supports the basic framework of a recent theory of the present author of strongly correlated impurity band superconductivity (impurity band resonating valence bond, IBRVB theory) in a template of a wide-gap insulator, with no direct involvement of valence band states.

Item Type:Article
Source:Copyright of this article belongs to National Institute of Materials Science.
Keywords:Superconductivity; Anderson-mott Transition; Diamond; Impurity Band RVB Theory
ID Code:1855
Deposited On:08 Oct 2010 11:55
Last Modified:16 May 2016 12:54

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